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Monitoring Programme for White-Tailed Eagle

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Monitoring Programme for White-Tailed Eagle MONITORING PROGRAMME FOR WHITE STORK CICONIA CICONIA Tibor Mikuska, B.Sc. Croatian Society for Bird and Nature Protection Range The species is widely distributed throughout the Palaearctic, from the Atlantic coast on the west to European parts of Russia on the east. The European population is divided into western and eastern flyway populations that migrate through the Gibraltar Strait and Bosporus, respectively (BirdLife International 2013). The total global population is estimated to be 701,237 – 703,607 individuals, with Europe holding 672,000 – 674,000 individuals (96% of the global breeding population) (Wetlands International 2013). Distribution in Croatia White Storks are distributed in the Pannonian lowlands and northern continental parts of Croatia that are bordered by the rivers Mura and Drava to the north, Danube on the east, and Kupa and Sava to the south (http://www.ptice.hr/rezultati_prebrojavanja_roda_2012_godine.htm). It breeds in villages and towns that are surrounded with appropriate wet habitats and extensively managed arable land. The highest breeding densities are found in the Lonjsko polje Nature Park (holding almost half of the national breeding population; Schneider 1989), along the River Sava floodplains, and Danube (Borovo) and Ilova Rivers (Marino Selo). The current (2011) Croatian White Stork breeding population is estimated to be 1,100 – 1,300 pairs (Institute of Ornithology, unpublished). It is considered to be stable, but this is questionable given recent national survey data. Habitat The White Stork favours open habitats, avoiding places with dense vegetation and extensive forest. During the breeding season they are associated with extensively managed arable land, wet meadows and pastures, shallow marshes and floodplains, rice paddies, fishponds, lakesides and irrigation ditches (BirdLife International 2013). After breeding, large flocks can be seen foraging in stubble or recently ploughed fields. In Croatia the preferred habitat types according to the National Habitat Classification are: For feeding: A.1. Permanent standing freshwaters; A.2.3.2. Permanent slow flowing waters; A.2.4. Channels; C.2. Central European wet meadows For breeding: J.1. Villages Storks are carnivores taking a wide range of food including insects, fish, amphibians, reptiles, small birds and small mammals that are picked up from the ground or in shallow water (Hancock et al. 1992). Phenology and population biology White Storks are true Palaearctic migrants arriving in Croatia by the end of March and leaving the breeding areas by the end of August. White Storks nest solitarily or in loose colonies of up to 60 pairs as in Čigoč, the European stork village in Lonjsko polje Nature Park. Nests are built in human settlements on roofs, chimneys, electric poles and hay stacks. While the number of nests built on electric poles and artificial platforms is increasing, only a small percentage of nests are built on trees. Breeding starts after the arrival from wintering sites in mid-April and the clutch size varies from 1 to 6 eggs. Incubation lasts from 33-34 days with both parents taking turns (del Hoyo et al. 1992, Hancock et al. 1992). The nestling period is 58-64 days; after fledgling the young birds remain dependent on their parents for another 7-20 days (del Hoyo et al. 1992, Hancock et al. 1992). By late August most of the White Storks leave Croatia for their African wintering sites. Immature birds stay primarily on their wintering grounds until reaching sexual maturity at 3 years old. Pressures and threats White Storks in Croatia are primarily threatened by habitat alteration from agricultural intensification (A02.01), drainage of wet meadows (J02.01, J02.03), conversion or abandonment of pastures (A02), river regulation and prevention of floods on floodplains (J02.04, J02.05). The use of biocides (A07) and pollution of surface waters (H01) significantly affect food availability and consequently reduce breeding success. Nest destruction (E06.02) still occurs despite financial incentives to house owners to keep nests on their roofs or chimneys. Collision with power lines and electrocution (D02, C03.03) are further causes of mortality. All impacts combined prevent the expected population growth in the country. Conservation measures and description of national legislative protection White Storks are a strictly protected species in Croatia under the Nature Protection Act (Official Gazette no. 139/08 i 57/11). Penalties for the persecution of the birds or habitat destruction are set to HRK 14,400 (EUR 1,920) per specimen. In 2008 a nest protection programme was initiated that provides financial incentives to the owners of houses that hold stork nests (FZOEU 2010). This programme has been expanded to most of the counties inside the White Stork breeding distribution. However, the future of the programme is uncertain due to financial difficulties. Part of the breeding population is covered by existing protected areas and 59% of the whole breeding population is covered by the future NATURA 2000 network and 10 proposed SPA’s. Injured or young storks are regularly collected and treated in the animal rescue centres at Zaprešić and Rušćica, whose work is funded by the state. Since the mid-1990s a nest protection programme has been jointly implemented by the government and the national electric power provider (HEP – Hrvatska Elektroprivreda) in order to safeguard nests built on electric pylons. As a result, many nests were transferred to new breeding platforms situated above the cables and thus preventing electrocution. This programme is continuing. Apart from the protection of nests, measures for safeguarding feeding habitats are necessary, such as prevention of agricultural intensification, pesticide use and irrigation and river regulation projects. Annexes of the Birds Directive • Annex I Croatian Red List Least concern (LC) – 2010 (Croatian Red List, in press). MONITORING PROGRAMME The basic scheme for White Stork monitoring consists of the following approaches: nest searching and mapping to establish breeding population size and range, two nest visits during the breeding season to establish breeding success, and counting of individual storks at preferred feeding and migratory stop- over sites. The monitoring should be organised within the White Stork Working Group scheme (or alternatively a Storks Working Group that covers both Ciconia species), led by the State Institute for Nature Protection and Institute of Ornithology. Data should be shared in a timely manner with the State Institute for Nature Protection and Institute of Ornithology, as well as with the IUCN Stork, Ibis and Spoonbill Specialist Group (http://www.wetlands.org/Aboutus/Specialistgroups/StorkIbisandSpoonbillSpecialistGroup/tabid/197/ Default.aspx). Data should be also supplied promptly to the relevant nature protection bodies (national and nature park administrations, as well as county institutions). Since the White Stork is a strictly protected species, any research and monitoring activities require a special permit issued by MENP. In addition, the relevant nature protection bodies, landowners and land users should be notified prior to conducting Fieldwork. Nest mapping Objectives The main objective of nest mapping is to locate White Stork nests to establish the breeding population size and range. Each stork territory can hold 1-2 nests, and nest mapping is the basic requirement for the White Stork monitoring programme. As an output of this activity the exact positions of stork nests would be available that would allow subsequent nest visits in order to establish annual breeding success. Fieldwork instructions Fieldworker requirements: Nest mapping is a time-consuming activity. However, since the White Stork is a large and conspicuous species associated with human settlements it is one of the widely known species to the public. Therefore, a very large group of volunteers (from school kids to retirement people) can and are willing to assist. The minimum requirement is that fieldworkers/volunteers can identify a White Stork nest, which is normally simple because the nests are massive structures and unlikely to be confused with nests of any other species. Fieldworker availability: Due to the relative simplicity of the task, a large number of fieldworkers and volunteers can be used, recruited from the general public and nature lovers (school children, bird watchers, nature lovers, students, retired people). Equipment: Apart from appropriate shoes/boots and clothes, fieldworkers should be supplied with GPS units and a digital camera (which many volunteers have on their smart phones), and field forms. Fieldwork timing: Nest mapping can take place year-round during favourable weather conditions. Fieldwork can last from the morning till evening hours to maximise the working day effort, but in most cases many volunteers would be “responsible” just for nearby nests. Methodology: Potential stork breeding habitats (villages and settlements) should be carefully searched for nests. In most cases, the nests are built on conspicuous places: pylons along streets, roofs or chimneys. However, finding nests can be difficult in towns or larger settlements where the observer’s view is obstructed by high buildings. In these cases, the help of local people is needed. When a nest is found its exact position should be recorded by the GPS, and information entered on the field data form (Annex 1). If a nest cannot be located but storks are present (circling pair, frequent flights over
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